What do you do to go to sleep when it is way past time to be asleep?

I have this lifelong history of getting really wound up mentally during the hour or two before bedtime. Then when I should be in the bed falling asleep, I am wide awake (as I am now). Sleep meds have minimal affect, hot showers the same, The best course for me seems to be on my leather couch doing something like fluther or some other meaningless but entertaining exercise. But I would love to know what you, if you have the sleep/wake under control.